| 络合吸收脱除NO体系中FeⅢ(EDTA)的生物还原 |
| 摘要点击 1485 全文点击 1197 投稿时间：2004-12-08 修订日期：2005-04-04 |
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| 中文关键词 FeⅢ(EDTA) 生物还原 NOx 烟气脱氮 |
| 英文关键词 FeⅢ(EDTA) bio-reduction NOx flue gas denitrification |
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| 中文摘要 |
| 利用驯化得到的微生物还原FeⅢ(EDTA)的研究结果表明,葡萄糖比乙醇和甲醇更适合于作为该体系的碳源;由于硝酸盐在反应过程中对FeⅢ(EDTA)的微生物还原形成抑制,选择铵盐为微生物生长的氮源;反应最适pH值范围为6~7;温度在30℃~40℃范围之间变化,FeⅢ(EDTA)还原率相差不大,温度大于40℃以后,还原率随温度升高而下降.碳源量和菌体接种量满足还原反应需要即可,过量碳源或菌体接种量对还原率没有明显的促进作用.在实验考察的浓度范围内,FeⅢ(EDTA)的生物还原符合1级反应动力学,最大反应速率γmax=1.3 mmol·(L·h)-1,半饱和速率常数km=53.5 mmol·L-1. |
| 英文摘要 |
| Reduction of FeⅢ(EDTA) with cultivated microorganisms in the system of nitric oxide removal by metal chelate absorption was investigated.Supplemental glucose stimulates the formation of FeⅡ)(EDTA) more than ethanol and methanol as the carbon sources.Ammonium salt was used to be as the nitric source instead of nitrate,which inhibits the reduction of FeⅢ(EDTA) due to the competition between the two electron acceptors.The optimal pH value was from 6 to 7.The reduction percentage of FeⅢ(EDTA) varied little with the range of 30℃～40℃ and decreased quickly with a temperature higher than 40℃.The bio-reduction could be achieved efficiently with enough carbon source and cell inoculation.The reduction rate did not increase with adding more amount of carbon source or cell inoculation.The bio-reduction rate could be described by Michaelis-Menten equation and fitted to the first order reaction kinetics.The maximum reaction rates γmax and the Michaelis constant km were 1.3 mmol·(L·h)-1 and 53.5 mmol·L-1 respectively. |
